Second Class - WHAT TO EXPECT

Second class filaments are filaments that may not meet the strict quality standards of higher-end filaments.

They are often labeled as such due to reasons such as a looser tolerance for diameter accuracy, the inclusion of multicolored transition filament, a cracked spool, or bad winding resulting in filament overlapping.

While these imperfections can impact the quality and consistency of the final print, second class filaments can still be a cost-effective option for those on a budget or hobbyists looking for more affordable printing materials.

It's important to keep in mind that second class filaments may require extra care and attention during use, and may not produce the same high-quality prints as top-tier filaments.

Let's look closer on the most common reasons why filament is labeled as Second class.

1. DIAMETER

Filament is labeled as second class when its diameter accuracy is not guaranteed within a tighter tolerance of +/- 0.02mm, but within a looser tolerance of +/- 0.05mm. This means that the diameter of the filament may vary more than the standard or higher quality filaments, which can impact the quality of the 3D prints.

(Filament diameter in 2nd class has tolerance +/- 0.05 mm)

Although second grade filaments may not have a precise diameter with a small tolerance, a tolerance of +/- 0.05mm is still satisfactory for most printers. Such filaments can be a cost-effective option for hobbyists and those looking for more affordable 3D printing materials.

2.OVERLAPPING

The second reason why filament may be labeled as second class is due to bad winding, which can result in filament overlapping. 

(Imperfect, overlapping winding)

When the filament is wound onto the spool, it should be done so in a uniform and tight manner to prevent overlapping and tangling. Filament with overlapping is labeled as second class to indicate that it may require extra attention and care during use.

3. CRACKED SPOOL

A third reason why filament may be labeled as second class is due to a cracked spool.

(Aesthetically unsatisfactory spool with kink)

While a cracked spool may not necessarily affect the quality of the filament itself, it can impact the user experience and result in frustration and wasted time for the user. Therefore, filament with a cracked spool may be labeled as second class to indicate that it may require extra care or attention during use.

4.TRANSITION FILAMENT

Another reason why filament may be labeled as second class is due to multicolored transition filament that is made after a color change in the extruder.

When switching between different colors, there can be a brief period where the two colors mix together, resulting in a multicolored section of filament.

(Red-blue transition filament PLA Plus) 

Second-class filament may include this transition filament as a way to reduce waste. They are always labeled as "Transition Filament" and have listed colours.

While the multicolored transition filament may not affect the functionality of the filament, it can impact the aesthetics of the final print.

   

(Transition filament: colour detail)

If the above beauty flaws don't bother you, feel free to check out the current Second Class offerings.